ABTO VoIP SIP SDK is well-known on the market for the following reasons:
- Windows, Android, and iOS platforms
- C++/C#.NET/VB.NET/VB6/Delphi/Delphi XE7/Java/objective-C samples
- Free demo versions in App Store and Google Store Play
- 263, H.264, G.729, OPUS and many other codecs
- Good documentation
- No per seat licensing
- High quality and quick technical support
- Frequent SDK updates for subscribers